LOL I have used salt with all kinds of loaches too.
I think this issue i based on personal perception of how their fish reacts to adding salt but I will say this if you add salt to a wound it is going to burn but that means it is healing I personally have had no ill effects using salt with my cats just be carefully not to overdose and I would not suggest using pimafix or melafix as it could disturb the bio balance in the tank and create a spike in nitrite nitrate or amonia
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This appears mostly about koi, albeit the claims are generalized to ALL f/w fish, and appears an extreme (and rude?) point of view from DR. BRIAN G. AUKES; PhD (there may or may not be an insentive to sell, so reader beware) but I thought I'd link it here anyway: http://www.tropicalfishmeds.com/
I can only guess he refers to Dr. Johnson of koivet.com who appears a reputable fish vet who many refer.